42 Engineering and design services in the field of industrial equipment for aluminum smelters; normalization of industrial equipment for aluminum smelters, namely, development of voluntary standards for equipment for aluminum smelters; normalization of industrial equipment for aluminum smelters, namely, developing quality control standards for aluminum smelters; design of refractory lining for aluminum smelters; engineering services, namely, inspection of refractory lining for aluminum smelters; installation and maintenance of computer software for telemetry systems used for data analysis and for control of equipment in aluminum smelters; design and development of prototype equipment for aluminum smelters used in metal fabrication and metal treatment; technical writing for others of operation, maintenance and training manuals for equipment and processes used in metal fabrication and metal treatment in aluminum smelters; testing, analysis, and evaluation of industrial equipment to improve and optimize equipment performance in aluminum smelters; computer programming services for the automation of equipment in aluminum smelters; research and development services in the field of industrial equipment used in aluminum smelters, specially for sectors such as treatment of molten metal, environmental safety and occupational safety and health